July 20, 1889

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Features

Pennsylvania Board of Health Notes

Novel Torpedo Boat Designing and Maneuvering

An Improved Washing Machine

A Mechanical Movement

Barton's Improved Fence

An Improved Annealing Box

Gerstle's Hinged Handle for Pans, Etc

An Improved Magnetic Ore Separator

Eberhardt's Universal Automatic Gear Cutting Machine

The New U. S. Cruiser Baltimore

By F. T. Drake

An Improved Globe Holder

Maria Mitchell

Improved Bar Channeling Stone Drill

A Nest-Building Frog

By Nicolas Pike

Departments

Recommended

New Books and Publications- July 20, 1889

Departments

Recently Patented Inventions- July 20, 1889

Index of Inventions- July 20, 1889

Business and Personal- July 20, 1889

To Inventors- July 20, 1889

Notes and Queries- July 20, 1889

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Digital Issue ?Read or download this issue’s articles online. *A printed copy of this issue is not included. $7.99

Print + Digital All Access Subscription ?Read or download this issue’s articles online. Plus, subscribe to get Print, Online and Tablet access to the next 12 new issues to be released as well as Online access to archives back to 1845. $99.00

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